If you think that traditional painting is too slow for making a portrait, here is an alternative method. You can prepare an image about your object, then you selectively hide your image part by part and use Photoshop brushes to carry out.
日本語: まだ 日本語 版の翻訳はありません。英語で見る — showing the original English article below.
Making a Nice Dog Portrait
日本語
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